[jira] [Created] (FLINK-7692) Support user-defined variables

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-7692:
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             Summary: Support user-defined variables
                 Key: FLINK-7692
                 URL: https://issues.apache.org/jira/browse/FLINK-7692
             Project: Flink
          Issue Type: Improvement
          Components: Metrics
    Affects Versions: 1.4.0
            Reporter: Chesnay Schepler
            Priority: Minor
             Fix For: 1.4.0


Reporters that identify metrics with a set of key-value pairs are currently limited to the variables defined by Flink, like the taskmanager ID, with users not being able to supply their own.

This is inconsistent with reporters that use metric identifiers that freely include user-defined groups constructted via {{MetricGroup#addGroup(String name)}}.

I propose adding a new method {{MetricGroup#addGroup(String key, String name)}} that adds a new key-value pair to the {{variables}} map in it's constructor. When constructing the metric identifier the key should be included as well, resulting in the same result as when constructing the metric groups tree via {{group.addGroup(key).addGroup(value)}}.

For this a new {{KeyedGenericMetricGroup}} should be created that resembles the unkeyed version, with slight modifications to the constructor and {{getScopeComponents}} method.



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